Charging device of the hopper type



July 12, 1932. ULLRlCH 1,866,781

CHARGING DEVICE OF THE HOPPER TYPE Filed March 22, 1928 Patented July12, 1932 UNITED STATES I GEORG PATENT OFFICE WEEK AKTIENGESELLSGHAFT,OI! MAGDEBUBG-IBUCKAU, GERMANY cmnemennvrcn on THE norms. ma

Application fled March 22, 1928, Serial No. 263,830, and in Germany May28, 1927.

This invention relates to charging devices for the feeding of materialsof any kind, the said charging devices being of the type wherein thematerial to be fed is contained in a hopper, a rotary drum or cylinderon which the material rests and the rotation of which allows andpromotes the discharge of the material from the hopper, being arrangedbelow said hopper.

In such devices, where a slide or damper has been provided in thecharging hopper with the object of regulating the quantity of materialfed, such regulation was not effected in a satisfactory manner, becausewhen the quantity of material fed was small, the feeding opening or slotwas so small that it was liable to become clogged or choked,

whereas when a wide opening was provided, the contents of the hopperwere hable to pass through it too rapidly. Moreover, the wear thematerial passing through the narrow space between the drum and the slidewas liable to be jammed against the surface of the drum, which was thusfurrowed. These difliculties were especially troublesome with thefeeding of materials comprising particles of relatively large size. Theprincipal object of the invention is to overcome these difiiculties,while enabling the quantity of material fed to be regulated within widelimits in a simple manner. 4

According to the invention means are provided whereby'relativeadjustment between the drum and the hopper can be accomplished.

In order that said invention may-be clearly understood and readilycarried into-effect, the same will now be described more fully withreference to the accompanying drawing illustrating in sectionalelevation an example in which the drum is associated with a magnet sothat the material fed is at the same time separated into magnetic andnonmagnetic material.

Below a charging hopper 1 is mounted a drum 2 which rotates about afixed magnet 3. The non-magnetic material falls over the drum 2 into adischarge conduit 4, whilst the magnetic material is attract d bythe-magnet of the drum or cylinder was considerable, as

3 and passes into another discharge conduit front of the circumferenceof the drum 2, the material will flow out even when the drum is vstationary, but when the line strikes the circumference of the drum thematerial will be discharged only if the drum rotates, and if forinstance the lower edge 8 of the discharge slide is moved so far thatthe line 7 nolonger strikes the drum 2 but strikes a bottom plate or thelike closing the hopper, a discharge cannot take place even when thedrum is rotating.

The'movement of the edge 8 for the purpose of regulating the rate offeeding can' be efiected in various ways. In this modification a toothedrack 10 is secured to the slide 9, carrying the edge 8 and mounted onthe discharge side of the hopper 1, the rack being actuated by means ofa pinion 11 and hand wheel 12. Moreover, the hopper 1 is adjustable inthe horizontal direction on guide ledges 13 of the casing 14. Theadjustment is effected b means of the screw spindle 15 and hand w eel16. The bottom part of the hopper is aided in a trough 17 the bottomplate of w ich extends to the circumference of 'the drum 2, and can beadjusted by means of a screw 18 The dotted lines in the drawing indicatethe extreme position of the hopper in one direction and the dot and dashlines indicate its extreme position in the other direction. It will beseen that when the drum is not rotating and the edge 8 is moved to theposition 8", the flow of material will be obstructed; a further movementof the slide valve 9 to bring its lower edge into the position 8" willresult in a complete prevention of the discharge or flow of thematerial.

The control of the movement of the edge 8 by means of the movement ofthe hopper has the advantage that the cross sectional area of passagefor the material will be left almost As is well known,-

unchanged, so that any chokin by material with large particles will notta e place even when the quantity of material charged is a minimum, andthe aforesaid wear due to 5 the narrowing of the slot will be avoided.The relative adjustment of the edge 8 may alternatively be effected bythe movement of the drum and trough. Instead of the magnetic drum amagnetic roller with an endless 10 conveyor band may be used. For thepurpose of handling material which does not flow easily, it is advisableto construct the device so that the hopper 1 or the trough 17 can beshaken. v When a separation of the material is not required, a simpledrum or roller can be used instead of a magnetic drum.

The hopper 1 may also be made to rock or swing about a horizontal axis,in which 2 case the trough 17 would have to be made arcuate.

Havin now particularly described and ascertaine the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. In a charging device for a magnetic separator,a-rotatin magnetic discharge drum, a hopper supplying material to saiddrum, an adjustable slide coordinated with the hopper and adjusting thedischarge area of said hopper and means for changing the amount of thedischarge area which is in contact with the drum, but leaving thedischarge area of the hopper substantially unchanged, by displacing thehopper relatively to the drum. 2. The combination of a rotating magneticdrum, a hopper comprising a slide and means for regulating the dischargearea of the hopper by adjusting said slide, a trough inter- 40 posedbetween drum and hopper, having its ottom substantially .tangential tothe drum, means for adjusting said trough in its longitudinal direction,and means for changing the amount of.discharge area in contact with thedrum, by moving the hopper along the bottom of the trough. 3. A chargingdevice comprising a material feeding hopper having an inclined wall, arotating drum su porting and discharging the material fed t roughsaidhopper at a natural angle of inclination, and means for adjustingthe relative positioning of said drumand hopper in a rectilineartangential direction whereby the amount of material discharged by saiddrum is regulated.

The foregoing specification signed at Berlin, Germany, this 2nd day ofMarch, 1928.

DR. Ina. H. o. GEORG- ULLRIOH.

